气相色谱-质谱法分析污水中溶解态有机物

采用0.45μm玻璃纤维滤膜将污水分离为悬浮态和溶解态有机物质,以二氯甲烷为萃取剂,采用液液萃取-气质联用法对污水中溶解态有机物进行测定,同时还对萃取条件(萃取次数,萃取时间,无机盐加入量)进行优化.结果表明:萃取回收率最高的是每个pH范围各萃取2次、静置5 min,氯化钠加入15g.该方法分析时间短,准确度好(样品平均加标回收率为91.1％ ～ 103％),精密度高(相对标准偏差小于5％),易于操作.

Determination of Dissolved Organic Compounds in Wastewater by GC-MS

Wastewater was separated as suspended and dissolved organic matter by 0.45 μm glass fiber filter, dissolved organic matter was determined by liquid-liquid extraction-GC-MS with CH2C12 , and extraction condition was optimized （extraction times, extraction time, inorganic salts content）. The results show that, the optimized extraction condition was two times extraction of each pH range, holding time was 5 min, and the amount of sodium chloride was 15 g, which was evaluated by the extraction recovery. The analysis method is time-saving, accurate （The spiked recoveries were in the range of 91.1% - 103 % ） and good precision （relative standard deviation was less than 5% ） , easy to operate.